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How to get total cost of start package table between two periods by sql query?

Problem: how to get total cost of start package table between two periods with a SQL query? alexaPackage from 28/06/2017 to 05/07/2017 8days cost ? Details I need to get total cost in start ...
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How To Add Days And Time For Instructor Schedule

Problem I need to make a database design (ERD) to display a schedule for every instructor, including the following: day of course (e.g. Saturday or Monday) time it will give course (period from 12 ...